VARIATIONS OF SMOKE INJECTION HEIGHT IN SUMATRA AND KALIMANTAN DURING THE FOREST FIRE PERIOD 2016-2020

• Main Author: Muhlis, Ahmad
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/68305
• Institution: Institut Teknologi Bandung

As one of the influential factors in the distribution of smoke, the height of the smoke injection is often associated with the stability of the atmosphere and the Atmospheric Boundary Layer (ABL). On the other hand, ABL has diurnal variations whose conditions and properties change such as different altitudes and stability between day and night. However, most of the previous studies did not consider the role of ABL variation on smoke vertical growth. The research linking the height of smoke injection with ABL is still limited to one time period, namely the morning or afternoon. So that the analysis of variations in smoke injection heights and their relationship to variations in ABL in the morning, afternoon, and evening needs to be done to be able to provide a more complete picture of the relationship between ABL and variations in smoke injection heights. MISR and CALIOP observation data were used to estimate the smoke injection height (H) during the July-November 2016-2020 forest fires period in Sumatra and Kalimantan. ERA-5 data are used to calculate the value of atmospheric stability and estimate the height of the ABL (ABLZ) at the point of fire source. Furthermore, a comparative analysis of the distribution of H with ABLZ and analysis of the relationship between the distribution of H and atmospheric stability was carried out. The results show that there is a similarity in the H variation and the H frequency is less than ABLZ (H<ABLZ) in Sumatra and Kalimantan. The average value of H for the morning and afternoon periods throughout the month shows that H is in the ABL layer and the frequency of H<ABLZ is more than 97% (morning) and 85% (afternoon). The relationship between atmospheric stability in ABL with the difference between H and ABLZ (H-ABLZ) was found to be better than ABL with H based on the frequency distribution of the two stability categories. This indicates that the effect of the static stability value on H is limited by ABLZ due to the presence of a stable layer at the top of the ABL.